Why is it giving me undefined function for the slope field?

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f=@(x,y)(exp(-x)-y)*(exp(-x)+2+y)
slopefield(f,[xmin,xmax],[-10,10],20)
hold on
drawode(f,[-10,10],2,3)
drawode(f,[-10,10],5,7)
hold off
  11 Comments
Torsten
Torsten on 9 Jul 2022
Edited: Torsten on 9 Jul 2022
The path given in
addpath('C:\Users\myname\Documents\MATLAB\myfunctions')
was just an example.
Once you find the file you search for, you must add the path to this file (i.e. your path) in the way as shown above.

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Answers (1)

David Goodmanson
David Goodmanson on 10 Jul 2022
Edited: David Goodmanson on 10 Jul 2022
Hello Brenda,
As an alternative to figuring out how to get that code up and running, or as a comparison, you can run your own code:
xmin = -3; xmax = 6, delx = .3;
ymin = -6; ymax = 6, dely = .3;
[x y]= meshgrid([xmin:delx:xmax],[ymin:dely:ymax])
f=@(x,y)(exp(-x)-y).*(exp(-x)+2+y); % change * to .*
th = atan(f(x,y));
linlen = .2; % line lengths
u = linlen*cos(th);
v = linlen*sin(th);
figure(1)
quiver(x,y,u,v,0,'showarrowhead',0)
grid on
axis equal
xlabel('x')
ylabel('y')

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